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The link on UEFI boot is pretty good, but most do not discuss the additional issues that Ultrabooks have. You have Intel SRT which (somehow) uses RAID to access the SSD. You have to turn off Intel SRT, and remove the RAID meta-data from both drives to get Ubuntu to install in UEFI mode.

Some computers just will not install in UEFI mode. They have (not per UEFI standard) modified UEFI to only boot Windows efi file. But there are work arounds for that. Boot-Repair can convert a BIOS install to UEFI and if needed rename files as a work around.

Ultrabooks also have dual video and if in nVidia mode you need nomodeset. Some allow you to set it to Intel video only but many are just automatic. Then you need to install bumblebee to use dual video.